Mysql中update数据使用case when批量更改！

1.先创建测试表和数据

 1 CREATE TABLE graduates (  
 2   name varchar(255) ,  
 3   income int4(255)   
 4 );  
 5 
 6 INSERT INTO graduates VALUES ('桑普森', '400000');  
 7 INSERT INTO graduates VALUES ('迈克', '30000');  
 8 INSERT INTO graduates VALUES ('怀特', '20000');  
 9 INSERT INTO graduates VALUES ('阿诺德', '20000');  
10 INSERT INTO graduates VALUES ('史密斯', '20000');  
11 INSERT INTO graduates VALUES ('劳伦斯', '15000');  
12 INSERT INTO graduates VALUES ('哈德逊', '15000');  
13 INSERT INTO graduates VALUES ('肯特', '10000');  
14 INSERT INTO graduates VALUES ('贝克', '10000');  
15 INSERT INTO graduates VALUES ('斯科特', '10000'); 

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